Measure the length of each room in feet
Measure the width of each room in feet
Multiply length by width to get each room’s square footage
Add the square footage of all finished rooms
Include hallways, closets, and finished living areas
Exclude unfinished spaces like garages, attics, and basements unless finished
Measure irregular spaces by breaking them into rectangles
Calculate each section separately and add them together
Use exterior measurements if calculating total house footprint
Double-check all measurements for accuracy
Round to the nearest whole square foot